CH4‐CO2 replacement in hydrate‐bearing sediments: A pore‐scale study
CH4‐CO2 replacement in hydrate‐bearing sediments: A pore‐scale study
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DOI：
10.1029/2010gc003339
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发表时间：
2010-12
期刊：
影响因子：
3.7
通讯作者：
J. Jung;J. Santamarina
中科院分区：
文献类型：
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作者：
J. Jung;J. Santamarina
向含CH4水合物的沉积物中注入CO2会导致CH4的释放，并在CH4水合物稳定区内形成CO2水合物。CH4-CO2替代允许回收能源CH4，同时捕获二氧化碳。在这项研究中，我们监测了在CH4水合物形成、CH4-CO2置换和水合物解离过程中的孔隙尺度的电阻和相对硬度的变化；实验也使用高分辨率的时间推移照相进行了观察。结果表明，CH4-CO2置换发生在局部和渐进的过程中，使得水合物总体质量保持固态，在沉积物尺度上不会出现硬度损失。其他实验结果证实，甲烷通过水和气体之间形成的水合物壳缓慢扩散；这可能允许气体-水合物-水相长期共存。
The injection of CO2 into CH4 hydrate‐bearing sediments causes the release of CH4 and the formation of CO2 hydrate within the CH4 hydrate stability field. CH4‐CO2 replacement allows for the recovery of an energy source, CH4, while trapping CO2. In this study, we monitor pore‐scale changes in electrical resistance and relative stiffness during CH4 hydrate formation, CH4‐CO2 replacement, and hydrate dissociation; experiments are also observed using high‐resolution time‐lapsed photography. Results show that CH4‐CO2 replacement occurs locally and gradually so that the overall hydrate mass remains solid and no stiffness loss should be expected at the sediment scale. Other experimental results confirm the slow diffusion of CH4 through the hydrate shell that forms between water and gas; this may allow for the coexistence of gas‐hydrate‐water phases for long periods of time.